By Marty Basch Globe correspondent BRETTON WOODS, N.H. - Between West Mountain's wide sweeping groomers are pockets of pleasure in the trees. The man behind Bretton Woods's growing trail blueprint, director of ski operations Chris Ellms, doesn't mind riding the quad on busy days and not seeing very many skiers or snowboarders on the buffed boulevards below. ``There is nobody on the trails but I can hear the squeals of family laughter in the woods,'' he says. ``That's an example of how
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